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参数资料
| 型号： | DS18S20 |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | Switch/Digital Output Temperature Sensor |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), 0.50Cel, RECTANGULAR, THROUGH HOLE MOUNT |
| 封装： | TO-92, 3 PIN |
| 文件页数： | 21/23页 |
| 文件大小： | 252K |
| 代理商： | DS18S20 |
DS18S20
7 of 23
MEMORY
The DS18S20’s memory is organized as shown in Figure 7. The memory consists of an SRAM
scratchpad with nonvolatile EEPROM storage for the high and low alarm trigger registers (TH and TL).
Note that if the DS18S20 alarm function is not used, the TH and TL registers can serve as general-purpose
memory. All memory commands are described in detail in the DS18S20 Function Commands section.
Byte 0 and byte 1 of the scratchpad contain the LSB and the MSB of the temperature register,
respectively. These bytes are read-only. Bytes 2 and 3 provide access to TH and TL registers. Bytes 4 and
5 are reserved for internal use by the device and cannot be overwritten; these bytes will return all 1s when
read. Bytes 6 and 7 contain the COUNT REMAIN and COUNT PER C registers, which can be used to
calculate extended resolution results as explained in the Operation—Measuring Temperature section.
Byte 8 of the scratchpad is read-only and contains the CRC code for bytes 0 through 7 of the scratchpad.
The DS18S20 generates this CRC using the method described in the CRC Generation section.
Data is written to bytes 2 and 3 of the scratchpad using the Write Scratchpad [4Eh] command; the data
must be transmitted to the DS18S20 starting with the least significant bit of byte 2. To verify data
integrity, the scratchpad can be read (using the Read Scratchpad [BEh] command) after the data is
written. When reading the scratchpad, data is transferred over the 1-Wire bus starting with the least
significant bit of byte 0. To transfer the TH and TL data from the scratchpad to EEPROM, the master must
issue the Copy Scratchpad [48h] command.
Data in the EEPROM registers is retained when the device is powered down; at power-up the EEPROM
data is reloaded into the corresponding scratchpad locations. Data can also be reloaded from EEPROM to
the scratchpad at any time using the Recall E
2
[B8h] command. The master can issue “read-time slots”
(see the 1-Wire Bus System section) following the Recall E
2 command and the DS18S20 will indicate the
status of the recall by transmitting 0 while the recall is in progress and 1 when the recall is done.
Figure 7. DS18S20 Memory Map
SCRATCHPAD
(POWER-UP STATE)
Byte 0
Temperature LSB (AAh)
Byte 1
Temperature MSB (00h)
EEPROM
Byte 2
TH Register or User Byte 1*
TH Register or User Byte 1
Byte 3
TL Register or User Byte 2*
TL Register or User Byte 2
Byte 4
Reserved (FFh)
Byte 5
Reserved (FFh)
Byte 6
COUNT REMAIN (0Ch)
Byte 7
COUNT PER °C (10h)
Byte 8
CRC*
*Power-up state depends on value(s) stored in EEPROM.
(85°C)
相关PDF资料 |
PDF描述 |
|---|---|
| DS18S20-SL+T&R | DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), 0.50Cel, RECTANGULAR, THROUGH HOLE MOUNT |
| DS18S20Z/T&R | DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), 0.50Cel, RECTANGULAR, SURFACE MOUNT |
| DS1963L-F5 | SPECIALTY MEMORY CIRCUIT, MEDB2 |
| DS1963S | SPECIALTY MEMORY CIRCUIT, MEDB2 |
| DS1985-F3 | 2K X 8 EEPROM 3V, RDB2 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS18S20/T&R | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:IC THERM MICROLAN HI PREC TO-92 |
| DS18S20/T&R | 功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| DS18S20+ | 功能描述:板上安装温度传感器 Prgmble Resolution 1-Wire Parasite Pwr RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| DS18S20+PAR | 功能描述:板上安装温度传感器 Prgmble Resolution 1-Wire Parasite Pwr RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| DS18S20+T&R | 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:TEMP SENSOR DGTL 1-WIRE 3PIN TO-92 - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERM MICROLAN HI-PREC TO-92 制造商:Maxim Integrated Products 功能描述:Board Mount Temperature Sensors Prgmble Resolution 1-Wire Parasite Pwr |
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